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BMC Public Health. 2012; 12: 666.
Published online Aug 16, 2012. doi:  10.1186/1471-2458-12-666
PMCID: PMC3490851
Association of sleep duration and insulin resistance in Taiwanese vegetarians
Jiunn-Kae Chang,1 Malcolm Koo,2 Vivia Yu-Ying Kao,1 and Jui-Kun Chiangcorresponding author1,3
1Department of Biotechnology, Chia Nan University of Pharmacy & Science, Tainan, Taiwan
2Dalla Lana School of Public Health, University of Toronto, Ontario, Canada
3Department of Family Medicine, Buddhist Dalin Tzu Chi General Hospital, 2 Min-Sheng Road, Dalin, Chiayi, Taiwan
corresponding authorCorresponding author.
Jiunn-Kae Chang: jkchang/at/mail.chna.edu.tw; Malcolm Koo: m.koo/at/utoronto.ca; Vivia Yu-Ying Kao: viviakao7175/at/gmail.com; Jui-Kun Chiang: jkch68/at/gmail.com
Received April 4, 2012; Accepted July 20, 2012.
Abstract
Background
Short sleep duration has been reported to associate with increased insulin resistance. However, no studies have investigated whether such association exists in vegetarians. The aim of this study was to investigate the association between sleep duration and insulin resistance in Taiwanese vegetarians.
Methods
A total of 1290 individuals were recruited from a regional hospital in south Taiwan during their regular routine physical examination. Only individuals who described themselves as Buddhist vegetarians were included in the study. Demographic information and clinical characteristics were collected and multiple logistic regression analysis was used to evaluate the association between sleep duration and insulin resistance.
Results
A total of 433 vegetarians were included in the study. Results from univariate logistic regression indicated that insulin resistance was significantly associated with male sex, greater waist circumference, higher triglyceride levels, lower high-density lipoprotein cholesterol levels, higher plasma creatinine levels, higher alanine transaminase levels, greater energy expenditure, and sleep duration of more than 8 hours per night. Multiple logistic regression revealed that insulin resistance was significantly and independently associated with sleep duration of more than 8 hours per night (odd ratios = 2.27, 95% confidence interval = 1.24, 4.11) after adjusting for waist circumference and levels of alanine transaminase.
Conclusions
Sleep duration of more than 8 hours per night is an independent risk factor associated with increased insulin resistance in vegetarians.
Keywords: Sleep duration, Insulin resistance, Vegetarian
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